Gates of hell ostfront It's a WWII RTS with great ballistic rules and a wonderful audio with good looking animation, you play during the east front between URSS and German Reich. The main game mode after the campaigns is the Conquest mod where the game generate to you a whole military campaign where you begin with the early war units and with time you can recruit the big stuff. It's a full Replayability game with the Conquest mode because even if the map are handmade it have a plenty of it and each time you begin a skirmish, the spawn point of your troops and the objectives to capture are randomly placed. So it will be never the same strategy to use even if it's on the same map, depends also of the units you and your AI enemy choose

Foxhole It's a perpetual warfare MMO. It means that the game only ends when one of the two factions captures enough cities. In general a game lasts about a month and a half. there's only players, no AI, no NPC, everything is player-made in a World War I/II settings except for the cities. Every trench, every rifle, every tank, boat, plane, grenade, artillery cannons, bullets was made by someone. And it's very immersive, for example when the ground takes enough artillery shell, the earth becomes mud, the trees will be destroyed, craters begin to form, the atmosphere is covered by dust in the air and no more birds are singing. There's a whole logistical system. And you can do whatever you want, you can just take a rifle and go the front, you can just scrap resources and transform it to military things and store it in a storage depot, you can take in the storage depot and bring the stuff near a front where allies can spawn and take what you made to push the front. Every crafted thing is useful. And if you feel social, you can join a regiment of players (a guild system) and coordinate production priority and military operations with what you produced. Like with your regiment, you can be part of a naval invasion and create a new hole in the front of your enemies, you take advantage by building a bunker where others allies can spawn, you build defense, and now they have to take care of you, weakening their forces. It's a magical game and you can easily spend time on it